build(deps): bump @mui/material from 5.16.7 to 6.4.3 (#759)

* build(deps): bump @mui/material from 5.16.7 to 6.4.3

Bumps [@mui/material](https://github.com/mui/material-ui/tree/HEAD/packages/mui-material) from 5.16.7 to 6.4.3.
- [Release notes](https://github.com/mui/material-ui/releases)
- [Changelog](https://github.com/mui/material-ui/blob/v6.4.3/CHANGELOG.md)
- [Commits](https://github.com/mui/material-ui/commits/v6.4.3/packages/mui-material)

---
updated-dependencies:
- dependency-name: "@mui/material"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

* fixup tests

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: George Adams <[email protected]>

package.json

@@ -12,8 +12,8 @@
     "@gatsbyjs/reach-router": "^2.0.1",
     "@headlessui/react": "^2.2.0",
     "@mdx-js/react": "^2.3.0",
-    "@mui/lab": "^5.0.0-alpha.175",
-    "@mui/material": "^5.16.7",
+    "@mui/lab": "^6.0.0-beta.26",
+    "@mui/material": "^6.4.3",
     "@mui/x-data-grid": "^7.24.1",
     "@mui/x-date-pickers": "^7.25.0",
     "@popperjs/core": "^2.11.8",